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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 54f115dd533653c43b3c5541bf5936b22e484474 authored by Pablo Galindo on 06 July 2020, 19:29:59 UTC, committed by GitHub on 06 July 2020, 19:29:59 UTC 
[3.9] bpo-41215: Don't use NULL by default in the PEG parser keyword list (GH-21355) (GH-21356)
 


(cherry picked from commit 39e76c0fb07e20acad454deb86a0457b279884a9)

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>

Automerge-Triggered-By: @lysnikolaou
1 parent 4981fe3
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Tip revision: 54f115dd533653c43b3c5541bf5936b22e484474 authored by Pablo Galindo on 06 July 2020, 19:29:59 UTC
[3.9] bpo-41215: Don't use NULL by default in the PEG parser keyword list (GH-21355) (GH-21356)
Tip revision: 54f115d
dup2.c 
/*
 * Public domain dup2() lookalike
 * by Curtis Jackson @ AT&T Technologies, Burlington, NC
 * electronic address:  burl!rcj
 *
 * dup2 performs the following functions:
 *
 * Check to make sure that fd1 is a valid open file descriptor.
 * Check to see if fd2 is already open; if so, close it.
 * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
 * Return fd2 if all went well; return BADEXIT otherwise.
 */

#include <fcntl.h>
#include <unistd.h>

#define BADEXIT -1

int
dup2(int fd1, int fd2)
{
    if (fd1 != fd2) {
        if (fcntl(fd1, F_GETFL) < 0)
            return BADEXIT;
        if (fcntl(fd2, F_GETFL) >= 0)
            close(fd2);
        if (fcntl(fd1, F_DUPFD, fd2) < 0)
            return BADEXIT;
    }
    return fd2;
}
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